xfstests: rebuild aclocal.m4

xfstests: rebuild aclocal.m4

The local m4 configuration has not been built in a long time.
Trying to rebuild it results in failures with dmapi library
detection and libxfs.h detection macros. Fix the errors and rebuild
it.

Note: the new format for the aclocal.m4 file uses m4_include
directives which means it is much smaller than before and won't
need updating unless we include new m4 macro files.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>